chore: depend on state_machines-diagram

.gitignore

@@ -7,7 +7,8 @@ Gemfile.lock
 InstalledFiles
 _yardoc
 coverage
-doc/
+doc/*
+!doc/switch.svg
 lib/bundler/man
 pkg
 rdoc

README.md

@@ -69,6 +69,16 @@ in the class.  The generated files will use an output filename of the format
 For examples of actual images generated using this task, see those under the
 examples folder.
 
+#### Example output
+
+Generate the sample diagram used in this README:
+
+```bash
+bundle exec ruby script/generate_example.rb
+```
+
+![Switch state machine](doc/switch.svg)
+
 ### Interactive graphs
 
 Jean Bovet's [Visual Automata Simulator](https://github.com/NimaGhaedsharafi/VAS)

lib/state_machines-graphviz.rb

@@ -1,3 +1,8 @@
 # frozen_string_literal: true
 
+require 'state_machines-diagram'
 require 'state_machines/graphviz'
+require 'state_machines/graphviz/renderer'
+
+# Set the renderer to use graphviz
+StateMachines::Machine.renderer = StateMachines::Graphviz::Renderer

lib/state_machines/graphviz.rb

@@ -2,8 +2,38 @@
 
 require 'state_machines'
 require 'graphviz'
-require 'state_machines/graphviz/monkeypatch'
 require 'state_machines/graphviz/graph'
+require 'state_machines/graphviz/renderer'
 require 'state_machines/graphviz/version'
 
+module StateMachines
+  module Graphviz
+    module_function
+
+    def draw(class_names, options = {})
+      if class_names.nil? || class_names.to_s.split(',').empty?
+        raise ArgumentError, 'At least one class must be specified'
+      end
+
+      # Load any files
+      if (files = options.delete(:file))
+        files.split(',').each { |file| require file }
+      end
+
+      class_names.to_s.split(',').each do |class_name|
+        # Navigate through the namespace structure to get to the class
+        klass = Object
+        class_name.split('::').each do |name|
+          klass = klass.const_defined?(name) ? klass.const_get(name) : klass.const_missing(name)
+        end
+
+        # Draw each of the class's state machines
+        klass.state_machines.each_value do |machine|
+          machine.draw(**options)
+        end
+      end
+    end
+  end
+end
+
 require 'state_machines/tasks/railtie' if defined?(Rails)